Upgrade jquery to 3.x

[lunny]

Since 1.x and 2.x may include security problem, maybe we should upgrade to 3.x. And for compitable, we could use jQuery Migrate .

[sapk]

Or maybe drop it ? Is it used a lot ?

[lunny]

I think many javascript library depend on it.

[kjellkvinge]

Related: #4384

[silverwind]

👍 on upgrade, 👎 on jquery.migrate, better to update any usage of deprecated/removed API than to rely on such bandaid solutions.